The word prophylactics is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 30
Highest Scoring Words With Friends™ Play In The Letters prophylactics
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Seven Letter Word Alert: (96 words)
accloys, acrylic, apishly, apricot, arctics, atrophy, calicos, caliphs, caloric, caltrop, calypso, capitol, captors, carhops, chaotic, charily, chariot, charity, chicory, chorals, clarity, clastic, clayish, clipart, coalpit, coarcts, cochair, coltish, copycat, copyist, cotylar, crisply, cryptic, crystal, cyclist, cyclops, happily, haptics, haricot, harlots, harpist, hastily, history, horsily, isopach, laptops, octarch, opacity, optical, ostrich, patrols, payslip, philtra, plastic, polaric, poplars, portals, practic, prosaic, psychic, pyloric, rhotics, ripstop, rosalic, sappily, scarily, scholar, schorly, scoriac, scrappy, scratch, scrotal, scythic, sharply, shiplap, shortly, soapily, soppily, splatch, splotch, starchy, stipply, stoical, strappy, stroppy, sylphic, tailors, toparch, topiary, topical, toprail, topsail, trophic, tropics, trysail, typical